Diffuser module and electric blower having the same

ABSTRACT

Disclosed herein is a diffuser module, including: a cover covering an impeller connected to a rotation shaft; a housing coupled with the cover and accommodating a driving module including the rotation shaft; a diffuser directing flow of air drawn by the impeller; and a coupling member coupling the cover and the housing, wherein the cover and the housing have their respective coupling portions in a shaft direction of the rotation shaft, and wherein the diffuser has a groove portion partly corresponding to the coupling portion of the cover at its outer circumferential portion.

CROSS REFERENCE TO RELATED APPLICATION

This application claims the benefit of Korean Patent Application No. 10-2013-0034392, filed on Mar. 29, 2013, entitled “Diffuser Module and Electric Blower Having the Same,” which is hereby incorporated by reference in its entirety into this application.

BACKGROUND OF THE INVENTION

1. Technical Field

The present invention relates to a diffuser module and an electric blower having the same.

2. Description of the Related Art

In general, a diffuser module for an electric blower of a vacuum cleaner includes an impeller cover covering an impeller, a diffuser, a front, and a housing accommodating a driving module.

The conventional electric blower as disclosed in the Patent Document below, for example, has problems in coupling the impeller cover with the housing, in that air flow in the diffuser may be disturbed due to the reduction in size, it is difficult to align the front and the impeller cover on the same axis, it is difficult to make the blower smaller and lighter due to the coupling structure of the impeller cover and the housing, and durability and robustness are deteriorated.

PRIOR ART DOCUMENT Patent Document

(Patent Document 1) US 20080014080 A

SUMMARY OF THE INVENTION

The present invention has been made in an effort to provide a diffuser module which does not disturb air flow in a diffuser even though a cover and a housing are coupled with each other in a shaft direction of a rotation shaft by a fixing member and may be smaller and lighter, and an electric blower having the same.

Further, the present invention has been made in an effort to provide a rotation module which may be more effectively assembled and have enhanced coupling force by virtue of assembly guide parts formed in a cover, a front and a housing, and an electric blower having the same.

According to a first preferred embodiment of the present invention, there is provided a diffuser module, including: a cover covering an impeller connected to a rotation shaft; a housing coupled with the cover and accommodating a driving module including the rotation shaft; a diffuser directing flow of air drawn by the impeller; and a coupling member coupling the cover and the housing, wherein the cover and the housing have their respective coupling portions in a shaft direction of the rotation shaft, and wherein the diffuser has a groove portion partly corresponding to the coupling portion of the cover at its outer circumferential portion.

The diffuser may include: a guide having a cylindrical shape at the outer circumferential portion; and a guide vane connected to the guide and directing the air drawn by the impeller, wherein the groove portion partly corresponding to the coupling portion of the cover is formed in the guide, and wherein the coupled portion of the cover is inserted into the groove portion.

The coupling portion of the cover inserted into the groove portion of the guide may be located as a surface of an inner circumferential portion of the guide.

The module may further include a front coupled with the diffuser, wherein the diffuser further includes a coupling bore and an assembly guide part for coupling with the front, and wherein the front includes a diffuser coupling groove and a diffuser assembly guide part respectively corresponding to the coupling bore and the assembly guide part of the diffuser.

The front may further include a housing coupling hole and a housing assembly guide part for fixedly coupling with the housing, wherein the housing includes a front coupling groove and a front assembly guide part respectively corresponding to the housing coupling hole and the housing assembly guide part of the front.

The coupling portion of the cover may be formed as a coupling groove indented in a radial direction of the rotation shaft, the coupling portion of the housing may be formed as a coupling groove extending in a shaft direction of the rotation shaft, and the coupling member may be inserted into a coupling bore of the cover and coupled with the coupling groove of the housing.

The cover may further include an assembly guide part formed as a protrusion or a groove, the coupling portion of the housing further includes an assembly guide formed as a groove or a protrusion corresponding to the assembly guide part of the cover.

The coupling portion of the housing may protrude in the shaft direction toward the cover and may protrude inwardly of the housing.

According to a second preferred embodiment of the present invention, there is provided an electric blower, including: an impeller having blades for drawing air from the outside; a diffuser directing flow of the air drawn by the impeller; a cover covering the impeller and the diffuser; a driving module including a rotation shaft connected to the impeller; a front coupled with the diffuser and having a bearing inserted therein for rotatably supporting the rotation shaft; a housing accommodating the driving module and coupled with the cover; and coupling members, one of which coupling the cover and the housing, and another of which coupling the diffuser and the front, wherein the cover and the housing have their respective coupling portions in a shaft direction of the rotation shaft, and wherein the diffuser has a groove portion partly corresponding to the coupling portion of the cover at its outer circumferential portion.

The driving module may include: the rotation shaft connected to the impeller and rotating the impeller; a magnet provided on an outer circumferential surface of the rotation shaft; an armature facing the magnet and including a stator core and a coil; and a bearing rotatably supporting the rotation shaft.

The diffuser may include: a guide having a cylindrical shape at the outer circumferential portion; and a guide vane connected to the guide and directing the air drawn by the impeller, wherein the groove portion partly corresponding to the coupling portion of the cover is formed in the guide, and wherein the coupled portion of the cover is inserted into the groove portion.

The coupling portion of the cover inserted into the groove portion of the guide may be located as a surface of an inner circumferential portion of the guide.

The diffuser may further include a coupling bore and an assembly guide part for coupling with the front, and wherein the front includes a diffuser coupling groove and a diffuser assembly guide part respectively corresponding to the coupling bore and the assembly guide part of the diffuser.

The front may further include a housing coupling hole and a housing assembly guide part for fixedly coupling with the housing, wherein the housing includes a front coupling groove and a front assembly guide part respectively corresponding to the housing coupling hole and the housing assembly guide part of the front.

The coupling portion of the cover may be formed as a coupling groove indented in a radial direction of the rotation shaft, the coupling portion of the housing may be formed as a coupling groove extending in a shaft direction of the rotation shaft, and the coupling member may be inserted into a coupling bore of the cover and coupled with the coupling groove of the housing.

The cover may further include an assembly guide part formed as a protrusion or a groove, the coupling portion of the housing further includes an assembly guide formed as a groove or a protrusion corresponding to the assembly guide part of the cover.

The coupling portion of the housing may protrude in the shaft direction toward the cover and may protrude inwardly of the housing.

The housing may have a stator core coupling portion formed therein and may further include a coupling member coupled with the stator core coupling portion, wherein an upper end of the stator core is supported by the coupling member.

The stator core may have a coupling protrusion portion formed thereon, and wherein the housing may further include a stator-core-insertion supporting groove at the inner circumferential surface, the coupling protrusion portion of the stator core being inserted into the stator-core-insertion supporting groove and thereby a lower end of the coupling protrusion portion is supported.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

FIG. 1 is an exploded perspective view schematically showing a diffuser module according to a preferred embodiment of the present invention;

FIG. 2 is a plan view schematically showing a diffuser and a cover of the diffuser module shown in FIG. 1; and

FIG. 3 is a cross-sectional view schematically showing an electric blower having the diffuser module according to the preferred embodiment of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

The objects, features and advantages of the present invention will be more clearly understood from the following detailed description of the preferred embodiments taken in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same reference numerals are used to designate the same or similar components, and redundant descriptions thereof are omitted. Further, in the following description, the terms “first,” “second,” “one side,” “the other side” and the like are used to differentiate a certain component from other components, but the configuration of such components should not be construed to be limited by the terms. Further, in the description of the present invention, when it is determined that the detailed description of the prior art would obscure the gist of the present invention, the description thereof will be omitted.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

FIG. 1 is an exploded perspective view schematically showing a diffuser module according to a preferred embodiment of the present invention, and FIG. 2 is a plan view schematically showing a diffuser and a cover of the diffuser module shown in FIG. 1.

As shown, the diffuser module 100 for an electric blower includes a cover 110, a diffuser 120, a front 130, and a housing 140.

The cover 110 covers an impeller (not shown) connected to a rotation shaft therein and the diffuser so that it accommodates the impeller and the diffuser 120, and is coupled with the housing 140.

To this end, the cover 110 has a vent hole (not shown) through which air is drawn from the outside, and a coupling portion 111 extending along the rotation shaft (not shown) connected to the impeller (not shown).

The coupling portion 111 servers to fixedly couple the cover 110 with the housing 140, and has a coupling member 151 inserted therein. The coupling member 151 is coupled with the housing 140 such that the cover 110 is fixedly coupled with the housing 140. The coupling portion 111 may be either a coupling groove indented in the radial direction of the rotation shaft or a coupling bore extending in the shaft direction.

Further, the cover 110 may have an assembly guide part for holding the position at the time of being coupled with the housing 140. The assembly guide part may be a protrusion or a groove, and a corresponding groove or a protrusion corresponding to the assembly guide part of the cover 110 may be formed in the housing 140. FIG. 1 shows a preferred embodiment in which an assembly guide protrusion 112 is formed in the cover 110, and an assembly guide groove 142 is formed in the housing 140.

With this configuration, in fixedly coupling the cover 110 with the housing 140, firstly the cover 110 and the housing 140 are coupled with each other and held at the position by the assembly guides of the cover 110 and the housing 140, and then the cover 110 and the housing 140 are coupled with each other by the coupling member 151, such that the assembly process can be performed more easily without defects or errors.

Next, the diffuser 120 includes a guide 121, a guide vane 122, and a coupling part.

Further, the guide 121 is formed at the outer circumferential portion of the diffuser in a cylindrical shape, and the guide vane 122 is connected to the guide so as to direct the air drawn by the impeller.

Further, the coupling part is provided for coupling the diffuser 120 with the front 130, and includes a coupling bore 124 and an assembly guide part 125. The coupling bore 124 is provided for inserting a coupling member 152 thereinto so as to fasten the front 130. The coupling member 152 may be a screw member. The assembly guide part 125 serves to set positions that the diffuser 120 and the front 130 are held, and temporarily hold the diffuser 120 and the front 130, at the time of coupling the diffuser 120 with the front 130. The assembly guide part 125 and may be a protrusion or a groove, and FIG. 1 shows the preferred embodiment in which the assembly guide part 125 is a protrusion.

Accordingly, the diffuser 120 and the front 130 are being firstly held by the assembly guide part, and then the diffuser 120 and the front 130 are secondly coupled with each other by the coupling member 152, such that the assembly process can be performed more easily without defects or errors.

In addition, at the guide 121 of the diffuser 120, a groove portion 123 corresponding to the coupling portion 111, i.e., the coupling portion of the cover 110 is formed. The groove portion 123 is formed so as not to disturb the air flow in the diffuser 120 when the coupling portion 111 of the cover is inserted into the groove portion 123 of the diffuser, in a such manner that the coupling portion 111 passes through the groove portion 123 in a radial direction of the rotation shaft so that it does not go into the diffuser 120, i.e., the inner side of the guide 121. That is, the coupling portion 111 is supported by the groove portion 123 so that it does not extend inwardly of the diffuser, and the coupling portion 111 is located as a surface of the inner circumferential surface of the guide 121.

With this configuration, the groove portion 123 of the diffuser 120 serves as a coupling guide for inserting the coupling portion 111 of the cover 110 without disturbing the air flow in the diffuser 120 when the cover 110 is coupled with the housing 140 by the coupling portion 111, such that the module may become smaller and lighter.

Next, the front 130 has a diffuser coupling groove 131 and a diffuser assembly guide groove for fixedly coupling the diffuser 120 with itself, and has a housing coupling hole 133 and a housing assembly guide part 134 for fixedly coupling the housing 140 with itself.

As described above, the diffuser coupling groove 131 and the diffuser assembly guide groove 132 correspond to the coupling bore 124 and the assembly guide part 125, respectively.

In the case in which the coupling member 152 is a screw member, the diffuser coupling groove 131 is a mating screw receiving groove.

The housing coupling hole 133 serves to couple the front 130 with the housing 140 by the coupling member 153, and the housing assembly guide part 134 serves to determine and temporarily fix the front 130 to the housing and may be a protrusion or a groove. FIG. 1 shows the preferred embodiment in which the housing assembly guide part 125 is a protrusion.

Next, the housing 140 accommodates a driving module (not shown) for rotating the impeller and is coupled with the cover 100. To this end, the housing 140 has a size and a shape conforming to the cover 110.

More specifically, the housing 140 has a coupling portion facing the cover, in which a cover coupling groove 141, a cover assembly guide groove 142, a front coupling groove 143, and a front assembly guide groove 144 are formed.

The cover coupling groove 141 corresponds to the coupling portion 111 formed in the cover and extends in the shaft direction. The cover coupling groove 141 is a screw receiving groove if the coupling member 151 is a screw member.

The cover assembly guide groove 142 serves to guide a coupling location at the time of coupling the cover with the housing 140, and corresponds to the assembly guide protrusion 112 of the cover 110.

Alternatively, as described above, a cover assembly guide protrusion may be formed in the housing instead of the cover assembly guide groove, and an assembly guide groove corresponding to the cover assembly guide protrusion may be formed in the cover.

The front coupling groove 143 is formed so that it corresponds to the housing coupling bore 133 formed in the front 130. In the case in which the coupling member 153 coupling the front 130 with the housing 140 is a screw member, the front coupling groove 143 may be a screw receiving groove.

Further, the front assembly guide groove 144 corresponds to an assembly guide part 134 formed in the front 130 described above, and serves to guide a coupling location at the timing of coupling the front 130 with the housing 140.

In addition, the housing of the diffuser module 100 according to the preferred embodiment of the present invention is optimally designed for fixedly coupling with a stator core.

Specifically, a coupling portion of the housing 140 may protrude in the shaft direction. The stator core 160 is inserted into an area other than the coupling portion, which does not protrude, and its upper portion may be fixedly supported by the coupling member 153.

Moreover, as shown in FIG. 3, the coupling portion of the housing 140 may protrude inwardly in a direction perpendicular to the shaft. Here, the coupling portion of the housing 140 protrudes inwardly with respect to a space which is not interfered at the time of coupling the stator core, and accordingly obtains a thickness to form the cover coupling groove 141, the cover assembly guide groove 142, the front coupling groove 143, and the front assembly guide groove 144.

Additionally, the housing 140 may further include a stator core coupling portion 145 for fixing the stator core. The stator core coupling portion 145 may be a screw receiving groove if a coupling member for fixing the stator core 160 to the housing is a screw member 154.

Further, the housing 140 may further include a stator-core-insertion supporting groove 146 which a part of the stator core 160 is inserted into and supports the lower end of the part of the stator core 160.

The stator-core-insertion supporting groove 146 extends in the shaft direction from an upper end of the inner diameter portion of the housing. Further, the stator core 160 has a coupling protruding portion 161 corresponding to the stator-core-insertion supporting groove 146.

Accordingly, the lower end of the stator core 160 coupled with the housing 140 is supported by the stator-core-insertion supporting groove 146 of the housing, its movement in the circumferential direction is limited, and its upper end is fixedly supported by the coupling member 154.

With this configuration, even though the cover 110 and the housing 140 are coupled with each other in the shaft direction by the fixing member, in the diffuser module 100 according to the preferred embodiment of the present invention, the coupling portion 111 of the cover is inserted into the grooves 123 of the diffuser 120 so that the groove portion serves as a coupling guide, and the coupling portion is supported by the groove portion so that it does not extend inwardly of the diffuser. Accordingly, the air flow is not disturbed, and the module may become smaller and lighter.

Additionally, by configuring the outer circumferential surface of the cover 110 of the cover 110 and the outer peripheral surface 120 of the housing as one surface, the module may not only become smaller and lighter but also have enhanced assembly strength and durability. Further, as shown in FIG. 1, the coupling portion of the housing protrudes inwardly toward the space in which the stator core is accommodated, such that the design for optimizing space usage may be achieved and thus the module may become smaller.

Further, in the diffuser module 100 according to the preferred embodiment of the present invention, the cover 110, the diffuser 120, the front 130 and the housing 140 has the respective assembly guide portions so that more efficient assembly process is achieved and the coupling force is enhanced.

FIG. 3 shows an electric blower including the diffuser module according to a preferred embodiment of the present invention. As shown, the electric blower 200 is configured to include a cover 210, a diffuser 220, a front 230, a housing 240, a driving module 250, an impeller 260 and a coupling member 271,272,273.

Specifically, the impeller 260 is connected to the driving module 250 so as to draw air from the outside, and has blades 261 for air flow.

The diffuser 220 directs the air drawn by the impeller 260 and is positioned facing the impeller 260.

The cover 210 covers the impeller 260 and the diffuser 220, and is coupled with the housing 240.

The housing 240 accommodates a driving module 250 including a rotation shaft 251 connected to the impeller 260 for driving the impeller 260, and has a cylindrical shape.

The cover 210, the diffuser 220, the front 230 and the housing 250 of the electric blower 200 shown in FIG. 3 are identical to the cover, the diffuser, the front and the housing of the diffuser module shown in FIGS. 1 and 2, respectively, and, therefore, descriptions on the redundant elements will be omitted.

As shown, a coupling bore 211 is formed in the cover 210, and a cover coupling groove 241 corresponding to the coupling bore 211 is formed in the housing 220. A coupling member 271 is inserted into the coupling hole 211 of the cover 210, and the coupling member 272 is fastened to the cover coupling groove 211 of the housing 220, such that the cover 210 and the housing 220 are coupled with each other.

The diffuser 220 includes a coupling bore 221 and an assembly guide part 222 to for being coupled with the front 230.

Further, a bearing 255 of the driving module 250 is inserted into the front 230, and a diffuser coupling groove 231 and a diffuser assembly guide groove 232 are formed for coupling the front 230 with the diffuser. The diffuser 220 is coupled with the front 230 by inserting the assembly guide part 222 formed in the front into the diffuser assembly guide groove 232 formed in the front 230, and by coupling the coupling member 272 with the diffuser coupling groove 231 of the front through the coupling hole 221 of the diffuser.

The driving module 250 is connected to the impeller 260 so as to rotate the impeller 260, and includes a rotation shaft 251, a magnet 252, an armature 254, and the bearing 255.

Specifically, the rotation shaft 251 is connected to the impeller 260 so that the impeller rotates with the rotation shaft 251, and thereby air is drawn from the outside by the rotation of the impeller.

Further, the magnet 252 generates the electromagnetic force for driving the rotation shaft along with the armature 254, and is coupled on the outer peripheral surface of the rotation shaft 251.

Further, the armature 254 includes a stator core and a coil, and is coupled with the housing 240 facing the magnet 252.

Moreover, as shown in FIG. 1, the stator core of the armature is inserted into the housing, and the upper end of the stator core is fixedly supported by the coupling member 273.

Further, the bearing 255 rotatably supports the rotation shaft 251, and includes a upper bearing and a lower bearing, respectively coupled with one side and the other side, i.e., the upper side and lower side of the rotation shaft 251. The upper bearing is inserted into the front 230.

The driving module 250 of the electric blower 200 may further include a magnet holder 253 accommodating the magnet 252.

With this configuration, the electric blower 200 having the cover module according to the present invention may become smaller and lighter even though the cover 210 and the housing 240 are coupled with each other by the fixing member 271 in the shaft direction, without disturbing the air flow in the diffuser 120.

As set forth above, according to the present invention, there can be provided a diffuser module which does not disturb air flow in a diffuser even though a cover and a housing are coupled with each other in a shaft direction of a rotation shaft by a fixing member and may be smaller and lighter, and an electric blower having the same. Further, by virtue of assembly guide parts formed in a cover, a front and a housing, there can be provided a rotation module which may be more effectively assembled and have enhanced coupling force, and an electric blower having the same.

Although the embodiments of the present invention have been disclosed for illustrative purposes, it will be appreciated that the present invention is not limited thereto, and those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention.

Accordingly, any and all modifications, variations or equivalent arrangements should be considered to be within the scope of the invention, and the detailed scope of the invention will be disclosed by the accompanying claims. 

What is claimed is:
 1. A diffuser module, comprising: a cover covering an impeller connected to a rotation shaft; a housing coupled with the cover and accommodating a driving module including the rotation shaft; a diffuser directing flow of air drawn by the impeller; and a coupling member coupling the cover and the housing, wherein the cover and the housing have their respective coupling portions in a shaft direction of the rotation shaft, and wherein the diffuser has a groove portion partly corresponding to the coupling portion of the cover at its outer circumferential portion.
 2. The module as set forth in claim 1, wherein the diffuser includes: a guide having a cylindrical shape at the outer circumferential portion; and a guide vane connected to the guide and directing the air drawn by the impeller, wherein the groove portion partly corresponding to the coupling portion of the cover is formed in the guide, and wherein the coupled portion of the cover is inserted into the groove portion.
 3. The module as set forth in claim 2, wherein the coupling portion of the cover inserted into the groove portion of the guide is located as a surface of an inner circumferential portion of the guide.
 4. The module as set forth in claim 1, further comprising a front coupled with the diffuser, wherein the diffuser further includes a coupling bore and an assembly guide part for coupling with the front, and wherein the front includes a diffuser coupling groove and a diffuser assembly guide part respectively corresponding to the coupling bore and the assembly guide part of the diffuser.
 5. The module as set forth in claim 4, wherein the front further includes a housing coupling hole and a housing assembly guide part for fixedly coupling with the housing, wherein the housing includes a front coupling groove and a front assembly guide part respectively corresponding to the housing coupling hole and the housing assembly guide part of the front.
 6. The module as set forth in claim 1, wherein the coupling portion of the cover is formed as a coupling groove indented in a radial direction of the rotation shaft, the coupling portion of the housing is formed as a coupling groove extending in a shaft direction of the rotation shaft, and the coupling member is inserted into a coupling bore of the cover and coupled with the coupling groove of the housing.
 7. The module as set forth in claim 1, wherein the cover further includes an assembly guide part formed as a protrusion or a groove, and the coupling portion of the housing further includes an assembly guide formed as a groove or a protrusion corresponding to the assembly guide part of the cover.
 8. The module as set forth in claim 1, wherein the coupling portion of the housing protrudes in the shaft direction toward the cover and protrudes inwardly of the housing.
 9. An electric blower, comprising: an impeller having blades for drawing air from the outside; a diffuser directing flow of the air drawn by the impeller; a cover covering the impeller and the diffuser; a driving module including a rotation shaft connected to the impeller; a front coupled with the diffuser and having a bearing inserted therein for rotatably supporting the rotation shaft; a housing accommodating the driving module and coupled with the cover; and coupling members, one of which coupling the cover and the housing, and another of which coupling the diffuser and the front, wherein the cover and the housing have their respective coupling portions in a shaft direction of the rotation shaft, and wherein the diffuser has a groove portion partly corresponding to the coupling portion of the cover at its outer circumferential portion.
 10. The blower as set forth in claim 9, wherein the driving module includes: the rotation shaft connected to the impeller and rotating the impeller; a magnet provided on an outer circumferential surface of the rotation shaft; an armature facing the magnet and including a stator core and a coil; and a bearing rotatably supporting the rotation shaft.
 11. The blower as set forth in claim 9, wherein the diffuser includes: a guide having a cylindrical shape at the outer circumferential portion; and a guide vane connected to the guide and directing the air drawn by the impeller, wherein the groove portion partly corresponding to the coupling portion of the cover is formed in the guide, and wherein the coupled portion of the cover is inserted into the groove portion.
 12. The blower as set forth in claim 11, wherein the coupling portion of the cover inserted into the groove portion of the guide is located as a surface of an inner circumferential portion of the guide.
 13. The blower as set forth in claim 9, wherein the diffuser further includes a coupling bore and an assembly guide part for coupling with the front, and wherein the front includes a diffuser coupling groove and a diffuser assembly guide part respectively corresponding to the coupling bore and the assembly guide part of the diffuser.
 14. The blower as set forth in claim 13, wherein the front further includes a housing coupling hole and a housing assembly guide part for fixedly coupling with the housing, and wherein the housing includes a front coupling groove and a front assembly guide part respectively corresponding to the housing coupling hole and the housing assembly guide part of the front.
 15. The blower as set forth in claim 9, wherein the coupling portion of the cover is formed as a coupling groove indented in a radial direction of the rotation shaft, the coupling portion of the housing is formed as a coupling groove extending in a shaft direction of the rotation shaft, and the coupling member is inserted into a coupling bore of the cover and coupled with the coupling groove of the housing.
 16. The blower as set forth in claim 9, wherein the cover further includes an assembly guide part formed as a protrusion or a groove, and the coupling portion of the housing further includes an assembly guide formed as a groove or a protrusion corresponding to the assembly guide part of the cover.
 17. The blower as set forth in claim 9, wherein the coupling portion of the housing protrudes in the shaft direction toward the cover and protrudes inwardly of the housing.
 18. The blower as set forth in claim 9, wherein the housing has a stator core coupling portion formed therein and further includes a coupling member coupled with the stator core coupling portion, wherein an upper end of the stator core is supported by the coupling member.
 19. The blower as set forth in claim 18, wherein the stator core has a coupling protrusion portion formed thereon, and wherein the housing further includes a stator-core-insertion supporting groove at the inner circumferential surface, the coupling protrusion portion of the stator core being inserted into the stator-core-insertion supporting groove and thereby a lower end of the coupling protrusion portion is supported. 